A method of performing an intra prediction coding with respect to a plurality of blocks included in an image frame is provided. The method of performing an intra prediction coding includes confirming whether a neighboring pixel that is referred to in an intra prediction of a block exists in the current frame, if the neighboring pixel referred to in the intra prediction exists, reading the color difference signal value of the pixel referred to in the intra prediction from the current image frame, if at least one neighboring pixel referred to in the intra prediction does not exist, reading the color difference signal value of at least one pixel from the previous image frame and performing the intra prediction with reference to the read color difference signal value of the pixel.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of performing intra prediction coding with respect to a plurality of blocks included in an image frame, comprising: confirming whether a neighboring pixel that is referred to in an intra prediction of a block exists in a current image frame; if the neighboring pixel referred to in the intra prediction exists, reading a color difference signal value of the neighboring pixel referred to in the intra prediction from the current image frame; if the neighboring pixel referred to in the intra prediction does not exist, reading a color difference signal value of at least one pixel from a previous image frame that corresponds to the block of the current image frame; and performing the intra prediction with reference to the read color difference signal value of the neighboring pixel and the read color difference signal value of the at least one pixel.
2. The method of claim 1 , wherein the step of reading the color difference signal value of at least one pixel from a previous image frame comprises: reading the color difference signal value of the at least one pixel positioned at the uppermost edge of the previous image frame, if the neighboring pixel referred to in the intra prediction does not exist in an upper region of the block.
3. The method of claim 1 , wherein the step of reading the color difference signal value of at least one pixel from a previous image frame comprises: reading the color difference signal value of the at least one pixel positioned at the leftmost edge of the previous image frame, if the neighboring pixel referred to in the intra prediction does not exist in a left region of the block.
4. The method of claim 1 , wherein the step of performing the intra prediction comprises performing an estimation of at least one intra prediction mode of the block with reference to the color difference signal value of the neighboring pixel included in the current image frame and/or the color difference signal of the at least one pixel included in the previous image frame.
5. An image coding apparatus comprising: an intra prediction unit for performing intra coding; wherein if a current image frame does not include at least one pixel value referred to in an intra prediction, the intra prediction unit reads the at least one pixel value referred to in the intra prediction from a previous frame.
6. A device including a processor programmed for performing intra prediction coding of a current image frame according to a method comprising steps of: determining a position of an image block within said current image frame, performing said intra prediction coding using neighboring pixels of said image block when said position of said image block satisfy a first set of criteria; and performing said intra prediction coding using said neighboring pixels and selected pixels from a previous image frame that corresponds to the said image of said current image frame.
7. The device of claim 6 , wherein said first set of criteria comprising at least one of: not on a left edge of said current image frame and not on an upper edge of said current image frame.
8. The device of claim 6 , wherein said selected pixels from said previous image frame correspond to pixels along a left edge of said current image frame.
9. The device of claim 6 , wherein said selected pixels from said previous image frame correspond to pixels along an upper edge of said current image frame.
10. The device of claim 6 , wherein said image block is selected from the group of blocks having size of: 4×4 and 16×16.
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February 13, 2009
June 19, 2012
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